JP5339603B2 - Motorcycle - Google Patents

Description

  The present invention relates to a motorcycle, and more particularly to an engine of a motorcycle.

  2. Description of the Related Art Conventional motorcycles are known in which an engine cylinder is tilted backward, an intake system component is connected to the front side of the engine, and an exhaust system component is connected to the rear side of the engine (see, for example, Patent Document 1). .

JP 2008-207789 A

  By the way, in the motorcycle described in Patent Document 1, since the structure of the exhaust pipe that is the exhaust passage is complicated, the flow of the exhaust is obstructed and smooth exhaust is difficult. In addition, it is difficult to adjust the length of the exhaust pipe, and the mass of the exhaust pipe is concentrated on the rear side of the vehicle.

  The present invention has been made in consideration of such circumstances, and its purpose is to enable smooth exhaust, to easily set the optimal exhaust pipe length, and to concentrate the mass of a motorcycle. The object is to provide a motorcycle that can be realized.

In order to achieve the above object, the invention according to claim 1 is an engine disposed between a front wheel and a rear wheel, and an intake system component disposed in front of a cylinder of the engine and connected to a front side of the cylinder. And an exhaust system component connected to the rear side of the cylinder, and the exhaust pipe of the exhaust system component extends forward through one side in the vehicle width direction of the engine. The engine bypasses the front of the engine, extends rearward through the other side of the engine in the vehicle width direction , and the exhaust pipe is disposed in front of the engine and bypasses the front of the down frame extending downward from the head pipe, It is arranged below the pair of main frames that diverge from the head pipe on both sides in the vehicle width direction and extends downward and inward in the vehicle width direction of the pair of main frames, and circulates in the engine in the down frame A radiator for cooling the cooling water is attached that, the exhaust pipe is characterized by passing the side of the down frame, and the lower radiator.
The invention according to claim 2 is an engine disposed between the front and rear wheels, an intake system component disposed in front of the engine cylinder and connected to the front side of the cylinder, and connected to the rear side of the cylinder. An exhaust system part, and in a motorcycle tilting the cylinder backward, an exhaust pipe of the exhaust system part extends forward through one side in the vehicle width direction of the engine, bypasses the front of the engine, It extends rearward through the other side in the vehicle width direction of the engine, and the upstream end of the exhaust pipe is disposed at a position overlapping the kick gear portion of the engine in a side view of the vehicle.

The invention according to claim 3 is characterized in that, in addition to the configuration of the invention according to claim 2 , the exhaust pipe is disposed in front of the engine and bypasses the front of the down frame extending downward from the head pipe. To do.

According to a fourth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, a muffler is connected to the downstream end of the exhaust pipe, and the connecting portion is located below the upper end of the engine. It arrange | positions at the feature.

According to the motorcycle of claim 1, the exhaust pipe of the exhaust system part extends forward through one side in the vehicle width direction of the engine, bypasses the front of the engine, and the other side in the vehicle width direction of the engine. Since the exhaust pipe is extended rearward, the layout of the exhaust pipe can be facilitated, so that the structure of the exhaust pipe is simplified and smooth exhaust can be performed. Moreover, since the freedom degree of the setting of the length of an exhaust pipe can be improved, the optimal length of an exhaust pipe can be set easily. Furthermore, since the exhaust pipe can be arranged close to the engine, the mass of the motorcycle can be concentrated.
According to the motorcycle of claim 1, the exhaust pipe is disposed in front of the engine and bypasses the front of the down frame extending downward from the head pipe, so that the length of the exhaust pipe can be increased. As a result, the layout of the exhaust pipe can be further facilitated.
According to the motorcycle of claim 2, the exhaust pipe of the exhaust system part extends forward through one side in the vehicle width direction of the engine, bypasses the front of the engine, and the other side in the vehicle width direction of the engine. Since the exhaust pipe is extended rearward, the layout of the exhaust pipe can be facilitated, so that the structure of the exhaust pipe is simplified and smooth exhaust can be performed. Moreover, since the freedom degree of the setting of the length of an exhaust pipe can be improved, the optimal length of an exhaust pipe can be set easily. Furthermore, since the exhaust pipe can be arranged close to the engine, the mass of the motorcycle can be concentrated.
In addition, according to the motorcycle according to claim 2, since the upstream end of the exhaust pipe overlaps with the kick gear portion of the engine in a side view of the vehicle, the dead space on the side of the kick gear portion is effectively used. Thus, the exhaust pipe can be laid out efficiently.

According to the motorcycle of the third aspect , the exhaust pipe is disposed in front of the engine and bypasses the front of the down frame extending downward from the head pipe, so that the length of the exhaust pipe can be increased. Further, the layout of the exhaust pipe can be further facilitated.

According to the motorcycle of claim 4 , since the muffler is connected to the downstream end of the exhaust pipe and the connecting portion is disposed below the upper end of the engine, the positions of the exhaust pipe and the muffler can be lowered. Therefore, the center of gravity of the motorcycle can be lowered.

1 is a left side view for explaining an embodiment of a motorcycle according to the present invention. It is a left view of the periphery of the engine shown in FIG. FIG. 3 is a left side view of the engine shown in FIG. 2. It is a top view of a body frame, an engine, and an exhaust pipe.

  Hereinafter, an embodiment of a motorcycle according to the present invention will be described in detail with reference to the drawings. It should be noted that the drawings are viewed in the direction of the reference numerals, and in the following description, front, rear, left and right, and top and bottom are in accordance with the direction seen from the driver, and the front of the vehicle is Fr, rear is Rr, left is L, and right is R, upper is shown as U, and lower is shown as D.

  As shown in FIG. 1, the motorcycle 10 of the present embodiment includes a head pipe 12 provided at a front end of a vehicle body frame 11, a pair of left and right main frames 13 that are separated from the head pipe 12 to the left and right and extend rearwardly downward. A pair of left and right pivot frames 14 connected to the rear end portion of the main frame 13 and extending downward, a pair of left and right rear frames 15 connected to the upper end portion of the pivot frame 14 and extending rearward, and an intermediate portion of the pivot frame 14. A pair of left and right subframes 16 extending rearward, a pair of left and right rear frames 15 and a rear bracket 17 to which rear ends of the pair of left and right subframes 16 are connected, and a pair of left and right downframes extending downward from the head pipe 12. 18 is connected to the lower end of the down frame 18 and the lower end of the pivot frame 14. The tom frame 19 and a pair of left and right engine support frames 20 that connect the intermediate portion of the down frame 18 and the rear portion of the main frame 13 are configured. The engine 50 is attached to the down frame 18, the bottom frame 19, and the engine support frame 20. Is suspended.

  The motorcycle 10 includes a front fork 21 that is supported by the head pipe 12 so as to be steerable, a front wheel WF that is rotatably supported by the lower end portion of the front fork 21, and a steering wheel attached to the upper end portion of the front fork 21. The swing arm 23 is swingably supported on the pivot frame 14, the rear wheel WR is rotatably supported on the rear end of the swing arm 23, and the swing arm 23 is suspended from the pivot frame 14. The rear wheel suspension device 40 and a seating seat 25 attached above the rear frame 15 are provided. 1 is a shroud that covers the sides of the main frame 13 and the down frame 18, and 27 is a front fender that covers the front wheel WF.

  As shown in FIG. 1, the rear wheel suspension device 40 has a rear cushion 41 whose upper end is swingably attached to the upper end of the pivot frame 14, and a lower middle portion of the rear cushion 41 and the lower middle of the swing arm 23. And a first link 42 having a substantially triangular shape that slidably connects the first part 42 and a second link 43 that swayably connects the first link 42 and the lower end of the pivot frame 14.

  The engine 50 is a water-cooled single-cylinder engine. As shown in FIGS. 1 and 2, the outer shell of the engine 50 is mainly a crankcase 51 and a cylinder block 52 attached to the front upper end of the crankcase 51. And a cylinder head 53 attached to the upper end of the cylinder block 52, and a cylinder head cover 54 covering the upper opening of the cylinder head 53. A radiator 31 for cooling the cooling water circulating in the engine 50 is attached to the down frame 18 disposed in front of the engine 50.

  As shown in FIG. 2, the engine 50 includes an engine hanger plate 32 that is bolted to the rear portion of the engine support frame 20, an engine hanger plate 33 that is bolted to the lower end portion of the down frame 18, and the bottom frame 19. Suspended by bolt fastening at an intermediate portion and disposed between the front wheel WF and the rear wheel WR.

  As shown in FIG. 3, a crankshaft 55 is rotatably supported on the crankcase 51, and a piston 57 is connected to the crankshaft 55 via a connecting rod 56. The piston 57 reciprocates in the cylinder axis C direction within the cylinder 52 a of the cylinder block 52. Further, in the present embodiment, the cylinder axis C is disposed so as to be rearwardly inclined toward the rear of the vehicle.

  A transmission 60 is housed in the rear part of the crankcase 51. The transmission 60 includes a main shaft 61 and a counter shaft 62 that are rotatably supported by the crankcase 51, and a kick start kick kick. A shaft 63, a shift drum 64, a plurality of drive gears 65 provided on the shaft of the main shaft 61, a plurality of driven gears 66 provided on the shaft of the counter shaft 62 and meshing with the plurality of drive gears 65, respectively. A kick gear (kick gear portion) 67 provided on the kick shaft 63 and meshing with the driven gear 66 is provided.

  A balancer 70 is housed in the front portion of the crankcase 51. The balancer 70 includes a balancer shaft 71 that is rotatably supported by the crankcase 51, and a balance weight 72 provided on the balancer shaft 71. . The balancer 70 is rotationally driven by the driving force of the crankshaft 55.

  The cylinder head 53 rotates with respect to the cylinder head 53, an intake valve 81 that opens and closes an intake port 53 a formed on the front surface of the cylinder head 53, an exhaust valve 82 that opens and closes an exhaust port 53 b formed on the rear surface of the cylinder head 53. A cam shaft 83 that is pivotally supported, a cam 84 that is provided on the cam shaft 83, a rocker shaft 85 that is provided on the cylinder head 53, and is pivotally supported by the rocker shaft 85, and is swung by the cam 84. The intake valve 81 is directly driven by a cam 84, and the exhaust valve 82 is driven by a rocker arm 86. That is, the engine 50 is a SOHC engine.

  As shown in FIG. 2, a throttle body 92 is connected to the intake port 53 a of the cylinder head 53 via a connection pipe 91, and an air cleaner 94 is connected to the upstream end of the throttle body 92 via an intake pipe 93. Is connected. In the present embodiment, the connection pipe 91, the throttle body 92, the intake pipe 93, and the air cleaner 94 are intake system components and are disposed in front of and above the cylinder block 52. In the present embodiment, the connection pipe 91, the throttle body 92, and the intake pipe 93 form an intake passage 90.

  As shown in FIG. 2, an exhaust pipe 95 is connected to the exhaust port 53 b of the cylinder head 53, and a muffler 96 is connected to the downstream end of the exhaust pipe 95. In the present embodiment, the exhaust pipe 95 and the muffler 96 are exhaust system components.

  The throttle body 92 includes a throttle valve 92a that opens and closes the intake passage 90, a control motor 92b that controls the opening of the throttle valve 92a, and a first injector 101 that injects fuel into the intake port 53a.

  The air cleaner 94 includes an air cleaner box 97, an air cleaner element 98 housed in the air cleaner box 97, and a second injector 102 that injects fuel into the inlet opening of the intake pipe 93.

  In the present embodiment, as shown in FIGS. 1, 2, and 4, the exhaust pipe 95 extends forward from the upstream end connected to the exhaust port 53 b through the left side in the vehicle width direction of the engine 50. The engine 50 and the down frame 18 are detoured forward and extend rearward through the right side of the engine 50 in the vehicle width direction. The exhaust pipe 95 extends forward from the upstream end connected to the exhaust port 53b through the right side in the vehicle width direction of the engine 50, bypasses the front of the engine 50 and the down frame 18, and the vehicle width of the engine 50 It may extend backward through the left side in the direction.

  Further, in the present embodiment, as shown in FIG. 2, the connection portion 99 between the exhaust pipe 95 and the muffler 96 is disposed below the horizontal line L1 passing through the upper end portion of the cylinder head cover 54 of the engine 50. The rocker shaft 85 disposed in the cylinder head 53 is disposed below the horizontal line L2 passing through the center of the shaft.

  Further, in the present embodiment, as shown in FIG. 2, the upstream end of the exhaust pipe 95 is disposed at a position overlapping the kick gear 67 that is a kick gear portion disposed in the crankcase 51 of the engine 50.

  As described above, according to the motorcycle 10 of the present embodiment, the exhaust pipe 95 of the exhaust system component extends forward through the left side in the vehicle width direction of the engine 50, bypasses the front of the engine 50, Since the engine 50 is extended rearward through the right side in the vehicle width direction, the layout of the exhaust pipe 95 can be facilitated, so that the structure of the exhaust pipe 95 is simplified and smooth exhaust can be performed. Moreover, since the freedom degree of the setting of the length of the exhaust pipe 95 can be improved, the optimal length of the exhaust pipe 95 can be easily set. Furthermore, since the exhaust pipe 95 can be disposed close to the engine 50, the mass of the motorcycle 10 can be concentrated.

  Further, according to the motorcycle 10 of the present embodiment, since the exhaust pipe 95 bypasses the front of the down frame 18, the length of the exhaust pipe 95 can be increased, so that the layout of the exhaust pipe 95 is further facilitated. Can be.

  Further, according to the motorcycle 10 of the present embodiment, the muffler 96 is connected to the downstream end of the exhaust pipe 95, and the connecting portion 99 is disposed below the horizontal line L1 passing through the upper end portion of the cylinder head cover 54 of the engine 50. Since the positions of the exhaust pipe 95 and the muffler 96 can be lowered, the center of gravity of the motorcycle 10 can be lowered.

  Further, according to the motorcycle 10 of the present embodiment, the upstream end of the exhaust pipe 95 is disposed at a position overlapping the kick gear 67 that is the kick gear portion of the engine 50 in the side view of the vehicle. The exhaust pipe 95 can be efficiently laid out by effectively using the dead space.

DESCRIPTION OF SYMBOLS 10 Motorcycle 12 Head pipe 18 Down frame 50 Engine 52a Cylinder 54 Cylinder head cover 67 Kick gear (kick gear part)
91 Connection pipe (intake system parts)
92 Throttle body (intake system parts)
93 Intake pipe (intake system parts)
94 Air cleaner (intake system parts)
95 Exhaust pipe (exhaust system parts)
96 Muffler (exhaust system parts)
99 Connection WF Front wheel WR Rear wheel L1 Horizontal line passing through the upper end of the cylinder head cover

Claims (4)

An engine disposed between the front and rear wheels;
An intake system component disposed in front of a cylinder of the engine and connected to the front side of the cylinder;
An exhaust system component connected to the rear side of the cylinder,
In a motorcycle that tilts the cylinder backward,
An exhaust pipe of the exhaust system component extends forward through one side in the vehicle width direction of the engine, bypasses the front of the engine, and extends rearward through the other side in the vehicle width direction of the engine. ,
The exhaust pipe is disposed in front of the engine, bypasses the front of a down frame extending downward from the head pipe, and is separated from the head pipe on both sides in the vehicle width direction and below a pair of main frames extending downward. And arranged inward in the vehicle width direction of the pair of main frames,
A radiator for cooling cooling water circulating in the engine is attached to the down frame,
The motorcycle according to claim 1, wherein the exhaust pipe passes through a side of the down frame and below the radiator . An engine disposed between the front and rear wheels;
An intake system component disposed in front of a cylinder of the engine and connected to the front side of the cylinder;
An exhaust system component connected to the rear side of the cylinder,
In a motorcycle that tilts the cylinder backward,
An exhaust pipe of the exhaust system component extends forward through one side in the vehicle width direction of the engine, bypasses the front of the engine, and extends rearward through the other side in the vehicle width direction of the engine. ,
The motorcycle according to claim 1, wherein an upstream end of the exhaust pipe is disposed at a position overlapping with a kick gear portion of the engine in a side view of the vehicle. The motorcycle according to claim 2 , wherein the exhaust pipe is disposed in front of the engine and bypasses the front of a down frame extending downward from the head pipe. The motorcycle according to any one of claims 1 to 3, wherein a muffler is connected to a downstream end of the exhaust pipe, and a connecting portion thereof is disposed below an upper end portion of the engine.

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